Saurolophinae is a
subfamily of
hadrosaurid dinosaurs. It has since the mid-20th century generally been called the
Hadrosaurinae, a group of largely non-crested hadrosaurs related to the crested sub-family
Lambeosaurinae. However, the name Hadrosaurinae is based on the genus
Hadrosaurus which was found in more recent studies to be more primitive than either lambeosaurines or other traditional "hadrosaurines", like
Edmontosaurus and
Saurolophus. As a result of this, the name Hadrosaurinae was dropped or restricted to
Hadrosaurus alone, and the subfamily comprising the traditional "hadrosaurines" was renamed the Saurolophinae. Recent phylogenetic work by Hai Xing indicates that
Hadrosaurus is placed within the monophyletic group containing all non-lambeosaurine hadrosaurids. Therefore, the traditional
Hadrosaurinae should be treated as before:
Hadrosauridae is divided into two clades:
Hadrosaurinae and
Lambeosaurinae.
